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RegEx -- Remove Trailing Spaces on Line

Posted on 2006-10-23
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Last Modified: 2010-08-05
Based on similar question:

http://www.experts-exchange.com/Programming/Programming_Languages/Dot_Net/VB_DOT_NET/Q_22032483.html

I want it to also remove trailing spaces on a line. The accepted answer might have this initialization instead:

        Dim originalText As String = vbCrLf & "Second line." & vbCrLf & _
            "  Third line, with leading space and trailing spaces.      " & vbCrLf & _
            vbCrLf & "Fifth line." & vbCrLf

How would it be, now?
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Question by:GivenRandy
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7 Comments
 
LVL 63

Expert Comment

by:Fernando Soto
ID: 17789205
Hi GivenRandy;

Try it this way. It will remove all white space before and at the end of each line.

        Dim originalText As String = vbCrLf & "Second line." & vbCrLf & _
            "  Third line, with leading space." & vbCrLf & _
            vbCrLf & "Fifth line." & vbCrLf
        Dim cleanedText As String = Regex.Replace(originalText, _
            "^(?<1>\r\n)*(?<2>\s*)(?<3>.*?)\s*$", _
            "$3" & vbCrLf, RegexOptions.Multiline)
        MessageBox.Show("-->" & cleanedText & "<--")

Fernando
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Author Comment

by:GivenRandy
ID: 17789317
And to also remove the blank lines?
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LVL 63

Accepted Solution

by:
Fernando Soto earned 2000 total points
ID: 17789470
Hi GivenRandy;

Sorry about that but I overlooked the replacement string when I adjusted the Regex pattern string. So replace this

    "$3" & vbCrLf

With this

    "$3"

Or copy and past this line into the code replacing the last one I posted.

        Dim cleanedText As String = Regex.Replace(originalText, _
            "^(?<1>\r\n)*(?<2>\s*)(?<3>.*?)\s*$", _
            "$3", RegexOptions.Multiline)

Fernando

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LVL 9

Author Comment

by:GivenRandy
ID: 17789667
Works precisely. Thanks!

By the way, I picked up the book "Master Regular Expressions" so that maybe I can improve my RegEx skills more quickly. Thanks for your help!
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Expert Comment

by:Fernando Soto
ID: 17789692
Not a problem, glad I was able to help. ;=)
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LVL 9

Author Comment

by:GivenRandy
ID: 17790137
I'm gonna have one more, with all of them laid out. I'm getting the hang of it, but still not getting all of them at once.
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Author Comment

by:GivenRandy
ID: 17790187
One more:

http://www.experts-exchange.com/Programming/Programming_Languages/Dot_Net/VB_DOT_NET/Q_22034559.html

You have been doing them correctly, but I keep adding specs (spec creep).
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